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EUGEN BARON RITTER 8v CARL KELLNERJ APPARATUS FOR THE MANUFACTURE OF GBLLULOSE 0R PAPER PULP FROM WOODY FIBER.

No. 329,214. Patented Oct. ,21, 1885.

v A P WITNRgSES: W 4AWRNTOR9 I MQ' ATTORNEYS UNITED STATES PATENT OFFICE.

EUGEN BARON BITTER AND CARL KELLNER, OF PODGORA, AUSTRIA- HUNGARY.

APPARATUS FOR THE MANUFACTURE OF CELLULOSE OR PAPER-PULP FROM WOODY FIBER.

SPECIFICATION forming part of Letters Patent No. 329,214, dated Application filed September 13, 1834. Serial No. 143,405. (No model.) Patented in Austria-Hungary August 2, 1883, No. 20,024 and Lo. 31,730; in France September 27, 1883, No. 157,754; in Belgium September 29, 1883,

October 27, 1885.

No. 62,748. and in Italy January 522, 1884, No

To all whom it may concern:

Be it known that we, EUGEN BARON BITTER and CARL KELLNER, subjects of the Emperor of Austria-Hungary, and residents of Podgora,

in the Empire of Austria-Hungary, have invented certain new and useful Improvements 1n Manufacturing Paper-Pulp, of which the following is a specification.

This invention has relation to an apparatus for the manufacture of cellulose or paper-pulp from woody fiber by the action of sulphurousacid solution or other similar or equivalent substance upon the fiber.

The invention which forms the subject-matter of the present application is adapted to the carrying out of a certain novel process which we propose to make the subject-matter of another application.

Our present invention, having in view the carrying out of the process referred to, therefore consists in the novel construction, combination, and arrangement of parts hereinafter described and specifically claimed.

Referring to the accompanying drawings,

Figure 1 is a vertical sectional view of our.

improved apparatus, and Fig. 2 a plan view of the same.

A B designate two boilers or digesters of the ordinary or any suitable size or construction, and should be lined with lead or other acidresisting substance, to prevent the deleterious action of the digesting-solution upon their exterior casing, which is ordinarily of iron.

0 designates a tank which contains the fresh solution by means of which the fiber is to be disintegrated; G, a tank adapted to contain fresh water. A pipe, 1, leads from the tanks 0 and C over the tops of the boilers, and branches 2 and 3 lead from the pipe 1 to and open into the boilers or digesters A B at a point in their sides slightly above gratings a b, which are fixed in the boilers to prevent the wood'from rising above the liquid contents of theboiler. The pipes 2 and 3 are provided with cocks 6 and ,5, by means of which the flow of liquid may be regulated, and when desired entirely out off. Alongside of and slightly below the: pipe 1 is arranged a pipe, 4, which has a communication with a steam-generator and a generator of sulphurous acid. (Not shown.) The pipe 4, after passing over the boilers A B, turns down and terminates at c, where it enters a conduit, 0. The pipe 4 has two branches, 7 and 8, which pass down alongside of the boilers A B and enter at the bottom of the same, where they are, provided with stop-cocks 9 10. In addition to the pipes 7 and 8, the pipe 4 has two other branch pipes, 11 12, which enter the boilers A B at the top thereof, and are provided with stop-cocks 13 14. The pipe 4 has also two stop-cocks, 15 16, whose purposes will be explained hereinafter. The boilers A and B are provided with wastepipes 17 18,through which the liquid contents of the boiler are allowed to run ofi' after having been used.

Operation: In describing the operation of the above apparatus it will be presumed that the same has been in operation for some time, and that the boiler A contains wood which has been treated with liquid already employed twice, and that the boiler B has been filled with fresh wood. From this point the apparatus is operated as follows: The cocks 6 9 are opened and the cooks 15, 16, 13, 14, and 5 are all closed. The fresh liquid is now forced from the tank 0, through the pipes 1 and 2, into the boiler A, displacing the twice-used liquid in the boiler A and forcing it over by way of the pipes 7 4 8 into the boiler B. After the boiler A has been filled with fresh liquid, as described, the cock 6 is closed, the cook 16 is opened, and steam, being turned into the )ipe 4, enters the boilers A and B through pipe 7 and 8, and the necessary boiling of the contents is thereby effected. After the boiling has been completed in boiler B, the cook 16 is closed, the cooks 14 and are opened, and the sulphurous acid and steam are blown off through the pipes 12 and 4 to the conduit 0, or conveyed off to a suitable regaining apparatus. Meanwhile the liquid contents of the boiler B are drawn off through pipe 18, and the boiler now contains only the partly-disintegrated wood. The liquid from boiler A is now forced into boiler B, (by admitting fresh water to pipe 1 from the tank C,) pursuing the same course as before, and is now liquid which has been used but once. Boiling is again efl'ected in boiler B, as before. Communication with the various pipes 2, l1, and 7 is now out ofi, and the boiler A is emptied and filled with fresh Wood. At this point the conditions of the boilers A B are the reverse of what they were at the point where the description of the operation ,co1nmenced-that is to say, boiler B contains wood which has been treated with liquid already used twice, and boiler A contains fresh wood. Here the operation of the boilers and their connections is as follows: The cocks 6, 15, 16, 13, and 14 are closed, and the cooks 5, 9, and being opened, the fresh liquid is forced into boiler B through the pipes l and 3, and the twice-used liquid passes to boiler A by way of pipes 8 4 7. The cock 5 being closed and 16 opened, and steam and sulphurous acid passed into the two boilers A and B through pipes 7 and 8, the boiling operation is continued to the required extent. After the boiling is completed, the cocks l3 and 15 are opened, and 16 being closed, the sulphurous acid and steam are blown off through pipes 11 and 4 and the liquid allowed to pass off through pipe 17.

Having described our invention, we claim- 1. Inan apparatus for boiling or digesting paper-pulp, the combination of two similar boilers, a tank for containing the digestingsolution, connected by pipes having suitable cocks to both said boilers, and a pipe for supplying sulphurous acid and steam to the boilers having branch pipes leading into the tops and bottoms of the same, substantially as described. Y

2. In an apparatus for boiling or digesting cellulose, the combination of two boilers or digesters, a tank for containing the digestingsolution, and a tank for containing fresh water, with a pipe for conveying steam and sulphurous acid to the boilers, both said tanks being connected by suitable pipes with the boilers, substantially as described.

3. In an apparatus for boiling 01' digesting paper-pulp, the combination of the boilers A B and the solution-tank G with the solutionpipe 1, having branches 2 and 3, leading to the said boilers, and the steam-pipe 4, having the branches 7 8 11 12, also leading to said boilers, substantially as described.

In testimony whereof we have affixed our signatures in presence of two witnesses.

EUGEN BRX. BITTER. CARL KELLNER. Vitnesses:

E. G. J. MOELLER, T. BARTA. 

